Fuel injecting mechanism



Nov. 12, 1935. F. A. THAHELD ,0

FUEL INJECTING MECHANISM Filed Aug. 15, 1932 s Sheets-Sheet 1 f/"l' A.ThaAc/a Nov. 12, 1935. THAHELD 2,020,624

FUEL INJ ECTING MECHANI SM F l A g 5, 1952 3 Sheets-Sheet 2 Nov. 12,1935. I THAHELD 2,020,624

FUEL INJEC'IING MECHANISM Filed Aug. 15, 1932 r 3 Sheets-Sheet 3 fr/TAa/ze/d Patented Nov. 12, 1935 UNITED STATES 2,020,624 FUEL mmcrmaMECHANISM Feri A. Thaheld, Dallas, Tex., minor to Guiberson DieselEngine Company, Dover, M, a corporation of Delaware Application August15, 1932. Serial No. 628.822

' Z'QIaims. (01. 123-139) This invention relates to new and usefulimprovements in fuel injecting mechanisms.

This application is filed as an improvement over my copendingapplication Serial No. 442,316, flied April 7, 1930. In my previousapplication the adjusting of the amount of fuel injected and theadjusting of the timing of the engine is accomplished by means of asingle cam actuated lever. The single lever controls both adjustmentsand it is an impossibility to adjust one independently of the other.

One object of my invention is to provide improved means, whereby theamount of the fuel injected and the instant or point of injection withrelation to the revolution of the crank shaft may be varied.

Another object of the invention is to provide means whereby the instantor point of the injection may be varied and the amount of the fuelinjected may be varied, either in conjunction with the variation in thetiming or independently thereof.

Another object of the invention is to provide an improved fuel injectingmechanism consisting of a pair of actuating levers, one riding upon theother, and arranged so that one lever will control the amount of fuelinjected. and the other will control the timing of the engine, and meansfor adjusting the levers either simultaneously'or independently of eachother. 7

Still another object of the'invention is to provide anjimproved fuelinjecting mechanism including a pair of operating elements which may besecured together, whereby the operation of one will simultaneouslyoperate the other, said elements being adapted to be operatedindependentlyof each other when the connection therebetween is broken.

the line 2-'2 of Figure 1,

Figure 3 is a transverse vertical sectional view taken on the line 3-3of Figure 2, and

Figure 4 is a detail of the hand control levers.

In the drawings the numeral l0 designates a portion of a crank casehaving a plurality of radial cylinders ll mounted'thereon. A crank shaftI2 is suitably mounted in the crank case and provided with a reartrunnion or extension l3. A fuel passage or line I is forinedwithin 6the wall of the crank case and liquid fuel is supplied thereto by a pipel5 from a booster pump (not shown), which receives fuel from a suitablesource of storag i Adjacent each cylinder I I the crank case is pro- 19vided with a cylindrical socket I! having an annular seat I I at itsbottom. A pump I9 is provided for each socket and each pump includes acylindrical barrel 20 seated in the socket through the bottom thereofinto the crank case. 15 The outer end of the socket is surrounded by aboss 23 having a flat surfacefor receiving a packing gasket 24, which isinterposed between the boss and an outwardly directed flange 25,preferably madeintegral with the pump barrel. Stud bolts II fastened inthe boss extend upwardly through the gasket and flange, and receive nutsI 21 whereby the pump, is fastened in place. f

It will be noted thatthepassages i4 connect with the socket l-1 belowthe packing 24. By 25 this arrangement leaking of the fuel oil isreduced to a minimum and the use of exterior connections between thefuel line and the pump is avoided. The pump is conveniently and securelyfastened in place and is readily removable when 9 necessary.

An annular groove 28 formed in the head II of the pump provides acircular passage for the fuel fluid, whereby such fluid may pass aroundthe pump, which removes. any obstruction to the free 35 flowing of thefluid through the fuel line ll.

The head is provided with fuel ports 20 extending I from the groove tothe bore ll. A strainer II encircles the groove and prevents the pumpfronr the fuel line.

A fuel plunger 32 having a close sliding fit in particles entering 0 Vthe bore 30 is provided throughout its length with a, plurality ofspaced annular grooves 33. Any fuel liquid which may seep between the"plunger and the surface of the bore will collect in these grooves andserve both as a lubricant and as seal rings for the plunger. The outerend of the plunger is normally slightly inward of, or substantiallyflush with, the ports 29, as is best 50 shown in Figure l. The inner endof the plunger has a convex boss 34, which rides in a comple mentarygroove 35 extending longitudinally on the upper side of an actuatinglever 36. The boss is held in engagement with the lever by a coiledspring 31 confined on the inner end of the barrel and engaging a flange38 surrounding said boss.

When the lever 36 is lifted the plunger 32 will be displaced outwardlybeyond the ports 29, and these ports will be closed at their inner endsuntil the plunger is returned. This will prevent back pressure airentering the ports 29 and finding its way into .the fuel line l4 so longas said ports are covered. The charge of liquid is displaced outwardlyby the plunger into a fuel tube 31' which is connected to the outer endof the pump l9. The other end of the tube is connected with an injector38. As the details of the pump and injector form no particular part ofthe invention, it is not considered necessary to further describe thesame. It is pointed out that the sizes and areas of the fuel supplyelements are such that a single stroke of the pump plunger will displacesufficient fuel liquid from the pump to provide the desired fuel chargewhich will be discharged into the cylinder from the injector.

A cam disk 39 (Figure 2) is mounted on the crank shaft l2. Adecompression ring 49 is rotatably confinedon the outer periphery of thecam disk and is provided with spaced ears 4|, one being provided foreach lever. A control disk 42 is mounted on the cam shaft and carries aplurality of ears 43. The ears 4! and 431 are arranged in pairs and eachpair carries a pivot bolt 44 on which an ear 45, at the rear end of alever 46, is journaled. The upper side of the lever 45 is provided witha smooth surface and the lever 36 is slidable thereon. Each lever 36 hasan ear 36 at its rear end journaled on a. pivot bolt .41 supported inears 48 of control rings 49, which are slidably mounted on the controldisk 42 and decompression ring 49. It is pointed out that the contactingsurfaces of the levers 36 and 46 are curved to are concentricto the axisof the cam disk 39 so as to provide for easy adjustment.

, The decompression ring 49 and the control disk and ring 42 and 49respectively, being free to rotate, and the levers being attachedthereto by the pivot bolts 44 and 41, it is obvious that by adjustingthe disk 42, or the ring 49, the levers 36 and. 46 are movedcircumferentially either in a clockwise or a counter-clockwisedirection, according to the direction said disk and ring are rotated.For rotating the disk 42, I have shown a very simple device (Figure 3)consisting of a link 50 pivotally connected to a bearing 5! secured onthe disk 42. The upper end of the link encircles a disk 52, which iseccentrically mounted on a shaft 53' supported in, the rear cover plate'54 (Figure 2) of the crank case iii. A hand lever is secured on theouter end of the shaft, and

by moving the lever the shaft is rotated, thereby rotating theeccentrically mounted disk 52 and either lifting or lowering the link50, and rotating the control disk 42 in a clockwise-or counterclockwisedirection. 4 l

For rotating the control ring 49, I provide another link 50 similar tothe link 59, which is pivotally connected to a bearing 5| on saidring.The upper end of this link encircles a disk 52", which is also supportedin the rear cover plate 54 above the shaft 53. A hand lever 55, fastenedto the outer end of the shaft 53', is positioned adjacent the hand lever55, and the adjustment of the disk 49 is accomplished in the same way asthe adjustment of the disk 42.

The hand lever 55 carries a segment 58, which is provided with anarcuate slot 51. A' bolt 58 secured to the lever passes through the slotand has a wing nut 59 on its outer end. By this'arrangement the twolevers can be secured together, and by operating either the control diskor ring,

the other is adjusted-accordingly. When it is desired to adjust oneindependently of the other,

. as will hereinafter be explained, the wing nut 5 ed on the peripheryof? this ring in the path of i0 rollers 63 carried by the outer ends ofthe lever 49 and traveling on said periphery. Each lug. as is best shownin Figure 1, has an inclined approach 64. As the roller 63 rides up thisapproach its lever is lifted, thus lifting the lever 35 riding 15thereon, whereby the plunger'32 is thus displaced. When the rollerreaches the upper surface of the lug it travels therealon thus holdingthe plunger outwardly beyond the ports 29 during such travel. The uppersurface of each lug 42 is 20 long enough to hold the plunger outwardlyuntil the injection of the fuel has been completed.

It will be seen that by adjusting the control ring 49 in a clockwisedirection, each lever 35 will be moved under the boss 34 of the plunger25 32 of each pump, so as to bring said boss nearer the outer end of thelever, and thereby increase the travel. of the pump plunger. By areverse adjustment of the ring 49, the stroke of the plunger is reduced.The stroke of the plunger 30 controls the amount of the fuel injectedand. it is obvious that by rotating the ring 49 any desired mixture offuel may be injected into the cylinder.

When the control disk 42 is rotated in a clock- 85 wise direction, theroller 63 on the lever 45 is advanced in the orbit of the cam 50, thusadvancing the timing. By a reverse adjustment of the disk, the timing isretarded. It has been found that when the disk 42 is adjusted and thetiming is changed, that it is necessary to adjust the ring 49 and thestroke of the plunger 32 proportionately. However, it is sometimesnecessary to ad- 'just the stroke of the plunger without increasing, orretarding, the timing. For this reason, the hand levers 55 and 55' arepositioned adjacent each other, and it is possible, by tightening thewing nut 59, to adjust both the control disk and ring 42 and 49simultaneously. Thus when the hand lever 55 is swung to rotate the 50disk 42, the hand lever 55 will adjust the ring 49 accordingly. When itis desired to lengthen or shorten the stroke of the plunger 32, the wingnut 59 is loosened and the hand lever 55' is operated independently ofthe lever 55. i

The description which has been given recites more or less detail of aparticular embodiment of the invention, which is set forth as new and'useful, however, I desire it understood that the invention is notlimited to such exact details of construction because'itis manifest thatchanges and modifications may be made within the scope of the appendedclaims, without departing from the spirit of the invention.

What I calim and desire to secure by Letters Patent, is:

1. In a fuel injecting mechanism, a fuel pump, a reciprocatingplungerworking in said pump, a lever engaging one end of said plungerand freely movable longitudinally with respect to said plunger, arotatable ring to which one end of said lever is pivoted, whereby saidlever may be adjusted longitudinally without radially displacing itspivot point, means for adjusting said ring to move said leverlongitudinally with relation to said plunger to vary the stroke of theplunger, a second lever underlying and supporting said first lever andfree from connection therewith so as to be freely moved without movingsaid first le ver, revolving means concentric to said ring periodicallyengaging the second lever for swinging the same, means concentric tosaid ring to which the second lever is pivoted, and means for adjustingsaid concentric means to move the second lever longitudinally in thepath of said revolving means to vary the time of fuel injection.

2. In a fuel injetcing mechanism, a fuel pump, a reciprocating plungerworking in said pump, a lever engaging one end of said plunger andfreely movable longitudinally with respect to said plunger, a rotatablering to which one end of said lever is pivoted, whereby said lever maybe adjusted longitudinally without radially displacing its pivot point,means for adjusting said ring .to move said lever longitudinally withrelation to said plunger to vary the stroke of the plunger, a secondlever underlying and supporting said first lever and free fromconnection therewith so as to be freely moved without moving said firstlever, revolving means concentric to said ring periodically engaging thesecond lever for swinging the same, means concentric tosaid ring towhich the second lever is pivoted,

means for adjusting said concentric means to move the second leverlongitudinally in the path of said revolving means to vary the time offuel injection, and means for connecting the actuating means for thering with the actuating means for the concentric means, whereby a singleoperation will actuate both the ring and the concentric means and adjustsaid levers in the same direction without changing the relation andspacing of their pivots.

FERI A. THAHELD.

